Schrödinger’s red pixel by quasi-bound-states-in-the-continuum

Schrödinger’s red pixel by quasi-bound-states-in-the-continuum

Science Advances

10.1126/sciadv.abm4512

http://dx.doi.org/10.1126/sciadv.abm4512

Zhaogang Dong, Lei Jin, Soroosh Daqiqeh Rezaei, Hao Wang, Yang Chen, Febiana Tjiptoharsono, Jinfa Ho, Sergey Gorelik, Ray Jia Hong Ng, Qifeng Ruan, Cheng-Wei Qiu, Joel K. W. Yang

Multidisciplinary

23 February 2022

Dong, Z., Jin, L., Rezaei, S. D., Wang, H., Chen, Y., Tjiptoharsono, F., Ho, J., Gorelik, S., Ng, R. J. H., Ruan, Q., Qiu, C.-W., & Yang, J. K. W. (2022). Schrödinger’s red pixel by quasi-bound-states-in-the-continuum. Science Advances, 8(8). https://doi.org/10.1126/sciadv.abm4512

While structural colors are ubiquitous in nature, saturated reds are mysteriously absent. This long-standing problem of achieving Schrödinger’s red demands sharp transitions from “stopband” to a high-reflectance “passband” with total suppression of higher-order resonances at blue/green wavelengths. Current approaches based on nanoantennas are insufficient to satisfy all conditions simultaneously. Here, we designed Si nanoantennas to support two partially overlapping quasi–bound-states-in-the-continuum modes with a gradient descent algorithm to achieve sharp spectral edges at red wavelengths. Meanwhile, high-order modes at blue/green wavelengths are suppressed via engineering the substrate-induced diffraction channels and the absorption of amorphous Si. This design produces possibly the most saturated and brightest reds with ~80% reflectance, exceeding the red vertex in sRGB and even the cadmium red pigment. Its nature of being sensitive to polarization and illumination angle could be potentially used for information encryption, and this proposed paradigm could be generalized to other Schrödinger’s color pixels.

Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

This research / project is supported by the A*STAR - Career Development Award (CDA)
Grant Reference no. : 202D8088

This research / project is supported by the A*STAR - AME Individual Research Grants (IRG)
Grant Reference no. : A20E5c0093

This research / project is supported by the Advanced Research and Technology Innovation Centre - Advanced Research and Technology Innovation Centre
Grant Reference no. : R-261-518-004-720

This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP20-2017-0001

This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP22-2019-0006

This research / project is supported by the National Research Foundation - Investigatorship Award
Grant Reference no. : NRFI06-2020-0005

https://oar.a-star.edu.sg/communities-collections/articles/12569

2375-2548

Institute of Materials Research and Engineering

http://doi.org/10.1126/sciadv.abm4512